Duplex escapement-wheel



(No Model.)

H. J. EISEN. DUPLEX BSOAPEMENT WHEEL.

No. 515,862. Patented Mar. 6, 1894.

UNITED STATES PATENT OFFICE.

HERMAN JOSEPH EISEN, on BROOKLYN, NEW YORK, ASSIGNOR TO EDWARD A. LOOKE,on BROOKLINE, MASSACHUSETTS.

DUPLEX ESCAPEMENT-WHEEL.

SPECIFICATION formingpart of Letters PatentNo. 515,862, dated March 6,1894.

Application filed June 28, 1893. Serial 110,479,068- (No model.)

To all whom it may concern:

Be it known that I, HERMAN JOSEPH EISEN, a citizen of the United Statesof America, and a resident of Brooklyn, in the State of New York, haveinvented a new and useful Improvement in Duplex Escapement-lvheels, ofwhich the following is a specification.

Heretofore the scape wheels of all duplex escapements, except those theteeth of which are laboriously shaped one by one by hand, have ofnecessity been made of soft brass so as to provide for forming theimpulse teeth in dies or for bending them to bring them into theirdifierent plane as compared with the spur-teeth or long teeth.Consequently Such scape-wheels have had to be made comparatively heavy,in order that the delicate long teeth might resist their contacts withthe balance-arbor, and are peculiarly liable to become bent in the handsof watch-makers so as to become inoperative.

The present invention consists in a peculiarly constructed hard-metalscape-wheel for duplex escapements, as a new article of manufacture, thesame being adapted to be cheaply manufactured by machinery exclusively,with the highly desirable absolute uniformity thus obtainable, and atthe same time to be made of exceedingly light weight, so as to opposeless inertia to the movement of the train than machine-made scape-wheelsas heretofore constructed.

A sheet of drawings accompanies this specification as part thereof.

Figure l of the drawings is a face view of the improved scape-wheel, andFig. 2 is a section on the line a;-x Fig. 1, with an appendedfragmentary elevation of the balance-arbor and its impulse pallet.

Like letters and numbers refer to like parts in both figures.

The improved scape-wheel A is or may be adapted to co-operate with anyordinary or improved balance-arbor B. Said scape-wheel A comprisesordinary long teeth, numbered 1 3 5 7 9 11 13 and 15 in the drawings,and intermediate impulse teeth, numbered 2 4: 6 8 10 12 14 and 1G in thedrawings. All the teeth project from the periphery of a flat rim 17,said long teeth lying in the plane of the rim, while said impulse teeth,being of greater thickness from bottom to top, as seen in Fig.

2, extend upward to a second plane, accord ing to the requirements ofduplex escapements. And said rim 17 is connected by the arms of a cross18, which is conveniently and preferably of the same thickness as therim and long teeth, with a drilled hub 19, which is preferably andconveniently of the same thickness as the impulse teeth. Said long teeth1 to 15 are thus adapted to engage successively with a balance-arbor Bor a hub thereon, and with its notch 20, and said impulse teeth 2 to 16to engage successively with an impulse-pallet 21, or its equivalent,carried by said arbor, in customary manner. 0, Fig. 2, represents anyordinary or improved balance wheel. The improved scape-wheel is at thesame time adapted to be made of shapepreserving hard lnetal and ofinertia-reduc- 7o ing light weight as above, and to be so made bymachinery exclusively. Its adaptation to be so manufactured is due toSaid extra thick impulse-teeth, involving no bending or likedisplacement of the metal, and to their peripheral location so as to becut in the stack. The process by which the improved scapewheel ispreferably and conveniently so manufactured is the subject matter ofanother specification of even date herewith, and forms no part of thepresent invention. The number of teeth may be increased or lessened, theimpulse teeth may project downward instead of upward, and other likemodifications will suggest themselves to those skilled in the art.

Having thus described the said improvement, I claim as my invention anddesire to secure under this specification-- As a new article ofmanufacture, a scape- 9c wheel for duplex escapements having long teethin the plane of its rim, and intermediate impulse-teeth, of extra widthfrom bottom to top, which project bodily from the periphery of said rim,and extend upward to 5 a second plane, substantially as hereinbeforespecified, for the purposes set forth.

HERMAN JOSEPH EISEN.

Witnesses THOS. D. RAMBAUT, ALEX. LEHMAN.

